Garmin Countersues Suunto in Patent Fight: Everything You Need to Know

The fitness watch world just got a lot more dramatic. What started as a relatively routine patent lawsuit from Suunto has turned into a full-blown legal battle with a surprisingly aggressive response from Garmin. And if you think this is just about these two companies, think again — this fight tells us a lot about where the entire fitness wearable industry is heading.

The Backstory

Before Strava sued Garmin back in October, there was Suunto. Actually, Suunto sued Garmin nearly two weeks before Strava did — it just flew under the radar. In September 2025, Suunto and its parent company, Dongguan Liesheng, filed a patent infringement lawsuit against Garmin in the U.S. District Court for the Eastern District of Texas.

That is notable because Suunto and Garmin have a complicated history. For nearly two decades, Suunto licensed various technologies from Garmin, including the Firstbeat analytics engine that powers much of the recovery and training load features in both Suunto and Garmin watches. The relationship ended amicably as both companies went in different directions. Now, with Suunto owned by a Chinese technology company (Dongguan Liesheng bought the brand in 2022), that relationship is apparently over.

Comparing the Lawsuits: Suunto vs Strava vs Garmin

This is not the first patent lawsuit Garmin has faced recently. In October 2025, Strava also sued Garmin over two patents related to segments and heat maps. But the cases could not be more different.

The Strava case lasted just 21 days. Strava filed, posted a combative message on Reddit from their executive team, and then voluntarily dismissed the case entirely. Why? Several reasons:

1. Garmin is Strava's biggest partner. Garmin users generate more Strava subscriptions and data than any other platform. Picking a fight with your meal ticket is rarely smart.

2. The patents were weak. Industry experts noted the Strava patents — especially around heat maps — seemed legally tenuous. Running the case risked invalidating the patents entirely.

3. Garmin never loses patent fights. In 15 years, Garmin has an almost spotless record defending against patent claims. They have a massive patent portfolio themselves and are not afraid to use it.

4. Strava needed an IPO. Industry observers speculated Strava filed the lawsuit to build a patent portfolio before going public — but picking their most important partner as the test case was strategically baffling.

The Suunto case is entirely different. Suunto is not suing over software features like segments. They are suing over fundamental hardware — golf shot tracking, respiration sensors, and most importantly, antenna design. These are core technologies that go to the heart of what a GPS watch does.

And unlike Strava, Suunto actually has a reasonable chance. Three of their five original patents relate to antenna design, which is genuinely hard to do in a metal watch.

Deep Dive: Why GPS Antenna Design Is So Hard

This is the most interesting technical part of the lawsuit, and it affects every premium GPS watch you buy.

The Problem: Metal Blocks Signals

GPS signals come from satellites orbiting Earth at about 20,200 kilometers. By the time those signals reach your wrist, they are incredibly weak. Your phone or watch GPS antenna is trying to pick up signals roughly equivalent to the power of a flashlight beam viewed from the moon.

Now add a metal case around that antenna. Metal reflects and absorbs electromagnetic signals. Put a GPS antenna inside a titanium or stainless steel watch case, and you have created a Faraday cage — essentially blocking the very signals you are trying to receive.

The Solution: Clever Engineering

Watch engineers have developed several approaches:

1. External antennas. The original Fenix watches had visible external GPS antennas — you can see the little "skeletal" wings on the case. This works but looks unusual and limits design.

2. Ceramic or polymer windows. Many watches use a small window of ceramic or polymer material in the bezel that is RF-transparent, allowing signals to pass through while maintaining the metal look.

3. Coupled feeding. This is what the research shows — instead of directly exciting the metal bezel as an antenna, engineers use a "coupled" approach where the bezel is indirectly energized. The metal becomes part of the antenna system without being the antenna itself.

4. Slot mode antennas. This is what Suunto's patents cover. By creating specific slots or gaps in the metal case, engineers can create effective antenna structures that work within the constraints of a sealed watch case.

5. Dual-band complexity. Adding L5 (or E5) frequency for improved accuracy makes this even harder. Now you need an antenna that works well across multiple frequencies simultaneously.

The GPS L1 wavelength is about 19 centimeters. For optimal reception, antenna designers want elements that are fractions of that wavelength. In a watch case that is maybe 45mm across, fitting an effective antenna is like solving a physics puzzle while also making the watch look good and survive being slammed against rocks.

This is why antenna patents are so valuable and contested. Every company that makes metal-cased GPS watches has had to solve this problem, and the solutions often overlap.

The Original Lawsuit: Suunto's Patents

Suunto alleged Garmin infringed on five patents:

1. Patent '241 — Golf shot tracking. Uses an accelerometer to detect when a club strikes the ball, then records GPS position.

2. Patent '306 — Respiration rate estimation. Determines breathing rate using heart rate sensor data and pulse interval analysis.

3. Patent '432 — Slot mode antenna design for wearable devices. (This one was later dismissed with prejudice.)

4. Patent '774 — Antenna placement in wrist-worn devices.

5. Patent '731 — Tunable antenna assembly for customizable devices.

Three of the five patents relate to antenna design — which makes sense given how complex it is to get good GPS reception in a metal watch case.

The '432 Patent Gets Dismissed

In January 2026, the parties jointly dismissed all claims related to the '432 patent with prejudice. That means it is permanently out of the case. Suunto is now down to four patents in the lawsuit.

Garmin's Response: The 218-Page Counterattack

Garmin did not take this sitting down. In late December 2025, they filed a 218-page answer and counterclaim. And from the reporting, it was not your typical legal filing.

DC Rainmaker, who has covered this extensively, described Garmin's response as having "sass" he has never seen from Olathe (Garmin's Kansas headquarters). Garmin reportedly argued Suunto "sued the wrong company" and made clear this feels like a lawsuit driven by Suunto's new parent company, not the Suunto engineering team people know and love.

Garmin also filed its own counterclaims with five patents:

1. Patent 10,271,299 — GPS antenna design
2. Patent 10,276,925 — GPS antenna design
3. Patent 10,856,794 — Training and recovery metrics (ironically, involving Firstbeat technology that Suunto used to license from Garmin)
4. Patent 11,318,351 — Training and recovery analytics
5. Patent 11,956,874 — Integrated watch flashlight

The irony: Suunto is suing Garmin over respiration rate technology that came from Firstbeat, which Garmin acquired. And now Garmin is countersuing over training and recovery metrics that also have Firstbeat roots. It is a patent fight where both sides are essentially arguing over the same technology pool.

The Timeline So Far

What This Means for Consumers

Here is the thing: this lawsuit is unlikely to affect what you can buy. Patent lawsuits in the tech world usually end in cross-licensing deals or settlements. Nobody is actually going to stop making watches.

But there are some things to watch:

1. Watch Prices Probably Will Not Change

These lawsuits are expensive, but they are unlikely to affect retail pricing. Both Garmin and Suunto will factor legal costs into their business like any other expense. The competitive market keeps prices in check.

2. Feature Development May Slow

This is more speculative, but patent disputes can make companies cautious about introducing new features. If a company is worried about getting sued over a new sensor or algorithm, they might delay or abandon development. That could mean slower innovation in areas like blood glucose monitoring or new training metrics.

3. The Firstbeat Connection Is Comedic

Both companies are fighting over technology that originally came from the same source. Firstbeat was acquired by Garmin in 2020, and now both Suunto and Garmin are claiming the other is infringing on related patents. It is a reminder that the fitness tracking industry has consolidated around a relatively small number of core technologies.

4. Chinese Ownership Changes Dynamics

Suunto was sold to Dongguan Liesheng in 2022. This lawsuit feels different from the old Suunto — the legal strategy is more aggressive, which is typical of patent troll behavior but unusual for a legacy sports brand. The Suunto that people know — the Finnish company that made watches for explorers — is not the same entity suing Garmin.

5. Antenna Tech Matters

The fact that three of the five patents are about antenna design tells us something: GPS performance in premium watches is still a hard engineering problem. Companies are spending real money to solve it, and they are willing to go to court to protect those solutions.

What's Next

The case is proceeding in the Eastern District of Texas, known for fast-moving patent cases. Discovery is underway, and a Markman hearing (where judges interpret patent claims) is reportedly scheduled for February 2027, with jury selection in August 2027.

Suunto has until April 13, 2026 to respond to Garmin's counterclaims.

For now, nothing changes for consumers. Garmin, Suunto, COROS, and Apple will all keep making watches. But it is a fascinating glimpse into how competitive the fitness watch market has become — and how much IP complexity hides behind every GPS fix and heart rate reading on your wrist.

The bigger lesson: the fitness tracking space is consolidating around a few core technologies, and companies are fighting hard to protect their position. Whether that leads to better products or just more lawyers remains to be seen.